JP5502844B2 - Valve-type writing instrument - Google Patents

Valve-type writing instrument Download PDF

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JP5502844B2
JP5502844B2 JP2011273524A JP2011273524A JP5502844B2 JP 5502844 B2 JP5502844 B2 JP 5502844B2 JP 2011273524 A JP2011273524 A JP 2011273524A JP 2011273524 A JP2011273524 A JP 2011273524A JP 5502844 B2 JP5502844 B2 JP 5502844B2
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晴男 小高
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株式会社 エポックケミカル
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Description

本発明はバルブ式筆記具、より詳細には、バルブ機構を備えた直液式のマーカー等の筆記具であって、芯をペン軸内部へ押し込むことによりバルブが開いてインクがインク貯留部に供出され、インク貯留部においてインクが芯に染み込んで筆記可能となるバルブ式筆記具に関するものである。   The present invention relates to a valve-type writing instrument, and more particularly to a writing instrument such as a direct liquid type marker provided with a valve mechanism, and the valve is opened by pushing the lead into the pen shaft, and ink is supplied to the ink reservoir. In addition, the present invention relates to a valve-type writing instrument that allows ink to soak into the core in the ink storage section.

マーカー等の筆記具は、軸内にインクを含浸させた中綿を装填する中綿式タイプと、軸内に直接インクを注入する直液式(生インク式)タイプとに大別される。従来のマーカーとしては中綿式のものが多かったが、中綿式の場合は、一端芯先が乾くと、再び筆記可能状態にまでインクが染み込むのに時間がかかり、また、素早く筆記した場合は、インクの染み込みが追い付かないために筆記した文字が掠れるという欠点がある。これに対して直液式の場合は、芯がインクタンク軸内に貯留されたインクに直接触れていてインクの染み込みが迅速なため、芯先の乾きがなく、素早く筆記した場合においてもインクの染み込みがこれに追従するため、筆記文字が掠れることもないところから、最近では、直液式のものが主流となってきている。   Writing tools such as markers are roughly classified into a batting type in which a batting with ink impregnated in the shaft is loaded and a direct liquid type (raw ink type) in which ink is directly injected into the shaft. As a conventional marker, there were many batting type, but in the case of the batting type, if the tip of the core dries up, it takes time for the ink to soak up to the state where writing is possible again, and when writing quickly, There is a drawback that the written letters are drawn because the ink penetration cannot catch up. On the other hand, in the case of the direct liquid type, since the lead is in direct contact with the ink stored in the ink tank shaft and the ink soaks quickly, the tip of the lead does not dry, and even when writing quickly Since penetrating follows this, handwritten characters are never drawn, so recently, direct liquid type has become mainstream.

ところで、直液式の場合は、芯に過剰にインクが染み出て、所謂インクのぼた落ち現象が起こるおそれがあるため、芯を押し込むことによって開放されるバルブ機構を介して芯にインクを染み込ませるバルブ式のものが多い。しかし、その場合においても、筆記時にインクタンク軸を握持するために軸内の空気が熱膨張し、あるいは、握持圧や気圧の関係で軸内の圧力が上昇することにより、芯に過剰にインクが染み出てインクのぼた落ちが起こるおそれがある。そこで、従来は、芯の内端部に発泡樹脂製の吸収環を嵌め付け、その吸収環で過剰インクを吸収することによってインクのぼた落ちを回避する方法が採用されている。   By the way, in the case of the direct liquid type, the ink oozes out excessively to the core and a so-called ink drop phenomenon may occur, so the ink is applied to the core via a valve mechanism that is opened by pushing the core. There are many valve type soaking. However, even in that case, the air in the shaft thermally expands to hold the ink tank shaft during writing, or the pressure in the shaft rises due to the gripping pressure or atmospheric pressure, resulting in excess in the core. The ink may ooze out and the ink may fall off. Therefore, conventionally, a method has been adopted in which an absorption ring made of a foamed resin is fitted to the inner end of the core, and excess ink is absorbed by the absorption ring to avoid ink drop.

しかるに、この従来のバルブ式で吸収環を用いる機構の場合は、芯のインクに接する部分が内端部のみと少ないために芯が乾きやすく、筆記掠れも生じやすい。そのため、芯を押し込んでのバルブ開放操作を頻繁に行わなければならない煩わしさがある。また、芯の押し込み操作を頻繁に行うために芯の先端が傷みやすく、インクが多量に残存していたとしても、使用できなくなることが少なくないという問題があった。   However, in the case of this conventional valve type mechanism using an absorption ring, since the portion of the core that contacts the ink is only the inner end portion, the core is easily dried and writing curl is likely to occur. For this reason, there is an inconvenience that the valve opening operation by pushing in the lead must be frequently performed. Further, since the lead pushing operation is frequently performed, the tip of the lead is easily damaged, and there is a problem that even if a large amount of ink remains, it cannot be used.

特開2008−6668号公報JP 2008-6668 A 特開2008−87422号公報JP 2008-87422 A 特開2008−155484号公報JP 2008-155484 A 実用新案登録第2594306号公報Utility Model Registration No. 2594306

上述したように、従来のバルブ式で吸収環を用いる機構の場合は、芯を押し込んでのバルブ開放操作を頻繁に行わなければならない煩わしさがあり、また、芯の押し込み操作を頻繁に行うために芯の先端が傷みやすく、多量のインクが残存しているにも関わらず、使用できなくなることが少なくないという問題があった。   As described above, in the case of a conventional valve type mechanism using an absorption ring, there is an inconvenience that the valve must be opened frequently by pushing in the lead, and the push-in operation of the lead is frequently performed. In addition, the tip of the lead is easily damaged, and there are many problems that it becomes impossible to use even though a large amount of ink remains.

そこで本発明は、このような問題のない、即ち、芯の多くの部分が常時インクに接する状態にされることで芯の乾きが防止されるために、芯の押し込みによるバルブの開放操作を頻繁に行う必要がなく、その操作を頻繁に行うことに起因する芯先の早期損傷もなく、また、芯に対するインクの染み込みが迅速なため、高速筆記の場合においても筆記文字の掠れが生じない、バルブ式筆記具を提供することを課題とする。   Therefore, the present invention does not have such a problem. That is, since many parts of the lead are always in contact with the ink to prevent the lead from drying, the valve is frequently opened by pushing the lead. There is no early damage to the nib due to frequent operation, and the ink soaks quickly into the nib, so there is no curl of written characters even in high-speed writing. An object is to provide a valve-type writing instrument.

上記課題を解決するための請求項1に記載の発明は、インクタンク軸と、前記インクタンク軸の先端開口部に嵌装されるバルブ収装筒と、前記バルブ収装筒に摺動可能に保持される芯とから成り、
前記バルブ収装筒内には、その先端側から順に、前記芯の後半部が摺動可能に挿入される芯挿入筒と前記芯挿入筒の外周面にその全長に亘って狭間隔置きに配設される環状板とから成っていて、前記芯挿入筒内に導入されたインクが前記各環状板間に流出可能に構成されるインク貯留部材と、インクの供給を制御するバルブ機構を内蔵していて、上面が前記インク貯留部材の底面に当接し、底面開口が、前記インクタンク軸内のインクを常時通流させるインク通流孔を有する蓋部材によって閉塞されるバルブユニットケースとが装填され、
前記バルブ機構は、前記芯が押し込まれることにより開いて前記インク通流孔を通して前記バルブユニットケース内に導入されているインクを前記インク貯留部材内に供出させ、前記インク貯留部材内に供出されたインクは、前記芯挿入筒から前記各環状板間に流出して前記各環状板間と前記バルブ収装筒の内周面との間のインク貯留空間を満たしてそこに貯留され、随時、後半部が前記芯挿入筒内に進入している前記芯に染み込み可能にしたことを特徴とするバルブ式筆記具である。
The invention described in claim 1 for solving the above-described problems is an ink tank shaft, a valve housing cylinder fitted into a front end opening of the ink tank shaft, and slidable on the valve housing cylinder. Consisting of a held core,
In the valve housing cylinder, a core insertion cylinder into which the rear half of the core is slidably inserted in order from the front end side and an outer peripheral surface of the core insertion cylinder are arranged at narrow intervals over the entire length thereof. An ink storage member configured to allow ink introduced into the core insertion cylinder to flow out between the annular plates, and a valve mechanism for controlling ink supply. And a valve unit case in which the top surface is in contact with the bottom surface of the ink storage member, and the bottom surface opening is closed by a lid member having an ink flow hole for allowing the ink in the ink tank shaft to always flow. ,
The valve mechanism is opened when the core is pushed in, and the ink introduced into the valve unit case through the ink flow hole is supplied into the ink storage member, and is supplied into the ink storage member. The ink flows out from the core insertion cylinder between the annular plates, fills the ink storage space between the annular plates and the inner peripheral surface of the valve housing cylinder, and is stored there. A valve-type writing instrument characterized in that a portion can penetrate into the core entering the core insertion cylinder.

一実施形態においては、前記芯挿入筒に縦溝を形成して前記縦溝が前記各環状板間に開口するようにすることにより、前記芯挿入内に導入されたインクが前記開口から前記インク貯留空間に流出するようにされる。 In one embodiment, by forming a vertical groove in the core insertion cylinder so that the vertical groove opens between the annular plates, the ink introduced into the core insertion cylinder is discharged from the opening through the opening. It flows out to the ink storage space.

一実施形態においては、前記インク貯留部材の環状板群が、後端に向かって縮まる緩いテーパ形状にされ、別の実施形態においては、前記バルブ収装筒の内周面が、先端に向かって縮まる緩いテーパ形状にされる。   In one embodiment, the annular plate group of the ink storage member has a loosely tapered shape that shrinks toward the rear end, and in another embodiment, the inner peripheral surface of the valve housing cylinder faces toward the front end. It is made into a loose taper shape that shrinks.

一実施形態においては、前記バルブユニットケース内に組み込まれる前記バルブ機構は、前記バルブユニットケース上面のインク供出口を開閉する弁体と、前記弁体を常時前記インク供出口を閉じるように付勢するリターンスプリングとで構成される。   In one embodiment, the valve mechanism incorporated in the valve unit case includes a valve body that opens and closes an ink outlet on the upper surface of the valve unit case, and urges the valve body to always close the ink outlet. And return spring.

本発明に係るバルブ式筆記具によれば、芯の後半部が、囲周部(環状板間)においてインクを貯留する芯挿入筒内に収まっていて常時インクに接しているために芯の乾きが防止され、以て、芯の押し込みによるバルブの開放操作を頻繁に行う必要がなくなり、その操作を頻繁に行うことに起因する芯先の早期損傷が防止され、また、高速筆記に際してのインク染み込みも迅速となるために、筆記文字の掠れが生じないという効果がある。   According to the valve-type writing instrument of the present invention, the latter half of the lead is contained in the lead insertion cylinder for storing ink in the surrounding portion (between the annular plates) and is always in contact with the ink. Therefore, it is not necessary to frequently open the valve by pushing in the lead, preventing early damage to the lead due to frequent operation, and ink soaking during high speed writing Since it becomes quick, there is an effect that the writing character is not distorted.

更に、インクタンク軸内に内圧変化が生じても、バルブ機構が機能してインクのインク貯留筒内への流入が阻止されるため、インクタンク軸内の内圧変化に起因するインクのぼた落ちが防止される効果がある。   Furthermore, even if an internal pressure change occurs in the ink tank shaft, the valve mechanism functions to prevent the ink from flowing into the ink storage cylinder, so that the ink drops due to the internal pressure change in the ink tank shaft. There is an effect to prevent.

本発明に係るバルブ式筆記具の一実施形態の正面図である。It is a front view of one embodiment of a valve-type writing instrument according to the present invention. 本発明に係るバルブ式筆記具の一実施形態の要部拡大断面図(芯非押し込み時)である。It is a principal part expanded sectional view of one Embodiment of the valve-type writing instrument which concerns on this invention (at the time of a core non-pressing). 本発明に係るバルブ式筆記具の一実施形態の要部拡大断面図(芯押し込み時)である。It is a principal part expanded sectional view (at the time of core pushing) of one Embodiment of the valve-type writing instrument which concerns on this invention. 本発明に係るバルブ式筆記具の一実施形態の分解斜視図である。It is a disassembled perspective view of one Embodiment of the valve-type writing instrument which concerns on this invention. 本発明に係るバルブ式筆記具におけるバルブ収装筒の構成を示す正面図及び縦断面図である。It is the front view and longitudinal cross-sectional view which show the structure of the valve | bulb accommodation cylinder in the valve-type writing instrument which concerns on this invention. 本発明に係るバルブ式筆記具におけるインク貯留部材の構成例を示す正面図、側面図及び縦断面図である。It is the front view, side view, and longitudinal cross-sectional view which show the structural example of the ink storage member in the valve-type writing instrument which concerns on this invention. 本発明に係るバルブ式筆記具におけるインク貯留部材の他の構成例を示す正面図、側面図及び縦断面図である。It is the front view, side view, and longitudinal cross-sectional view which show the other structural example of the ink storage member in the valve-type writing instrument which concerns on this invention. 本発明に係るバルブ式筆記具におけるバルブユニットケースの構成を示す正面図及び縦断面図である。It is the front view and longitudinal cross-sectional view which show the structure of the valve unit case in the valve-type writing instrument which concerns on this invention. 本発明に係るバルブ式筆記具における蓋部材の構成を示す正面図及び縦断面図である。It is the front view and longitudinal cross-sectional view which show the structure of the cover member in the valve-type writing instrument which concerns on this invention.

本発明を実施するための形態につき、添付図面を参照しつつ説明する。図1は、本発明に係るバルブ式筆記具の一実施形態の正面図、図2、3はその縦断面図、図4はその分解斜視図であり、それらに示されるように、本発明に係るバルブ式筆記具は、インクタンク軸1と、インクタンク軸1の先端部に嵌め付けられるバルブ収装筒2と、先端部が、バルブ収装筒2の先端縮径部3に摺動自在に支持されて該先端縮径部3から突出するようにバルブ収装筒2に保持される芯4と、図示せぬキャップとから成る。なお、以下の説明は、各部品の筆記具先端側(図において左側)を上面とし、各部品の筆記具後端側を下面(又は底面)としたものである。   DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of an embodiment of a valve-type writing instrument according to the present invention, FIGS. 2 and 3 are longitudinal sectional views thereof, and FIG. 4 is an exploded perspective view thereof. The valve-type writing instrument includes an ink tank shaft 1, a valve housing cylinder 2 fitted to the tip portion of the ink tank shaft 1, and a tip portion slidably supported by the tip diameter-reduced portion 3 of the valve housing tube 2. The core 4 is held by the valve housing cylinder 2 so as to protrude from the tip diameter-reduced portion 3 and a cap (not shown). In the following description, the writing instrument front end side (left side in the figure) of each component is the top surface, and the writing instrument rear end side of each component is the bottom surface (or bottom surface).

バルブ収装筒2内には、その先端側から順に、インク貯留部材5とバルブユニットケース6とが装填される。インク貯留部材5は、基板7の中央に延設されて芯4の後半部が摺動可能に挿入される芯挿入筒8と、芯挿入筒8の外周面にその全長に亘って狭間隔置きに配設される円形の環状板9とから成っていて(図6、7参照)、後述するようにしてインク貯留部材5に導入されたインクが、各環状板9間の隙間とバルブ収装筒2の内周面とに囲まれるインク貯留空間11を満たすように構成される。
An ink storage member 5 and a valve unit case 6 are loaded into the valve housing cylinder 2 in order from the tip side. The ink storage member 5 extends in the center of the substrate 7 and is inserted into the core insertion cylinder 8 into which the rear half of the core 4 is slidable. (See FIGS. 6 and 7), and the ink introduced into the ink storage member 5 as described later is disposed between the gaps between the annular plates 9 and the valve housing. The ink storage space 11 surrounded by the inner peripheral surface of the cylinder 2 is filled.

インクが上記インク貯留空間11を満たすようにするため、一実施形態においては、芯挿入筒8に、1又は複数の縦溝10が形成され、該縦溝10形成部が各環状板9間に開口するようにされる(図6(D)、図7(C)参照)。この構成の場合は、バルブユニットケース6の上面に開設されるインク供出口12から出たインクが縦溝10内に入り込み、縦溝10内を上昇しつつ各環状板9間の開口から出てインク貯留空間11を充填する。その場合、縦溝10内に導入されたインクの一部は、後半部が芯挿入筒8内に収装されている芯4に染み込んでいく。   In order to make the ink fill the ink storage space 11, in one embodiment, one or more vertical grooves 10 are formed in the core insertion cylinder 8, and the vertical groove 10 forming portion is interposed between the annular plates 9. It is made to open (refer FIG.6 (D) and FIG.7 (C)). In the case of this configuration, the ink that has come out of the ink outlet 12 that is opened on the upper surface of the valve unit case 6 enters the vertical groove 10 and goes up from the openings between the annular plates 9 while rising in the vertical groove 10. The ink storage space 11 is filled. In that case, a part of the ink introduced into the longitudinal groove 10 soaks into the core 4 which is housed in the core insertion cylinder 8 in the latter half.

図7は、インク貯留部材5の他の実施形態を示すものであり、その実施形態においては、芯挿入筒8の後半部、即ち、後述する開閉ピース12が収まる部分の内径が前半部の内径よりも大径に形成されている。   FIG. 7 shows another embodiment of the ink storage member 5. In this embodiment, the inner diameter of the rear half of the core insertion cylinder 8, that is, the part in which the opening / closing piece 12 described later is accommodated is the inner diameter of the front half. It is formed in a larger diameter than.

芯挿入筒8の各環状板9の径は、バルブ収装筒2の内径に対応して形成され、その基板7がバルブ収装筒2の内周面に密着するようにされる。そして、一実施形態においては、環状板9は後端に向かって縮径化する緩いテーパ形状に形成される(図6参照)。そのようにすることにより、後端に向かう程、バルブ収装筒2の内周面との間隙が拡がってインク貯留空間11が拡がり、逆に、先端側は、バルブ収装筒2の内周面に近接してインクが漏れにくくなる。また、図7に示す実施形態におけるように、各環状板9の径は均一にし、バルブ収装筒2の内周面を緩いテーパ形状に形成することによっても、同じ作用効果が得られる。   The diameter of each annular plate 9 of the core insertion cylinder 8 is formed corresponding to the inner diameter of the valve housing cylinder 2 so that the substrate 7 is in close contact with the inner peripheral surface of the valve housing cylinder 2. And in one Embodiment, the annular plate 9 is formed in the loose taper shape which diameter-reduces toward a rear end (refer FIG. 6). By doing so, the gap with the inner peripheral surface of the valve housing cylinder 2 is expanded toward the rear end, so that the ink storage space 11 is expanded, and conversely, the front end side is the inner periphery of the valve housing cylinder 2. Ink is less likely to leak close to the surface. Further, as in the embodiment shown in FIG. 7, the same effect can be obtained by making the diameters of the annular plates 9 uniform and forming the inner peripheral surface of the valve housing cylinder 2 in a loosely tapered shape.

インク貯留部材5は上記構成であるため、バルブユニットケース6から供出されたインクは、芯挿入筒8の縦溝10内に流入して芯4に染み込み、余剰のインクは縦溝10の開口から各環状板9間の狭い間隙内に流出してインク貯留空間11を充填し、そこに貯留される。そして、インク貯留空間11内に貯留されたインクは、後半部が芯挿入筒8内に収まっている芯4に、随時染み込んでいくことになる。   Since the ink storage member 5 has the above-described configuration, the ink delivered from the valve unit case 6 flows into the longitudinal groove 10 of the core insertion cylinder 8 and soaks into the core 4, and excess ink is introduced from the opening of the longitudinal groove 10. The ink flows out into a narrow gap between the annular plates 9, fills the ink storage space 11, and is stored therein. Then, the ink stored in the ink storage space 11 soaks into the core 4 whose latter half is accommodated in the core insertion cylinder 8 as needed.

バルブユニットケース6内には、その上面に開設されるインク供出口12を開閉する弁体13と、弁体13を常時インク供出口12を閉じるように付勢するリターンスプリング15とが組み込まれる(図2、3参照)。弁体13は、底部にテーパ形状の弁座当接部を有する開閉ピース14と、開閉ピース14を受ける支持部14aとから成り、組み立て時において、開閉ピース14の上部がインク供出口12から突出し、上記芯挿入筒8の後半部内に摺動可能状態にて進入する(図2、3参照)。また、支持部14aには、側方に張り出す鍔部14bが形成されると共に、該鍔部14bにストッパー14cが連設される。このストッパー14cは、後述するように、芯4の押し込み端を規制する役目を果たす。   In the valve unit case 6, a valve body 13 that opens and closes an ink outlet 12 that is opened on the upper surface thereof, and a return spring 15 that constantly biases the valve body 13 so as to close the ink outlet 12 are incorporated ( 2 and 3). The valve body 13 includes an opening / closing piece 14 having a tapered valve seat abutting portion at the bottom and a support portion 14a for receiving the opening / closing piece 14. The upper portion of the opening / closing piece 14 projects from the ink outlet 12 during assembly. Then, it enters the second half of the core insertion cylinder 8 in a slidable state (see FIGS. 2 and 3). Further, the support portion 14a is formed with a flange portion 14b projecting laterally, and a stopper 14c is continuously provided on the flange portion 14b. As will be described later, the stopper 14c serves to regulate the pushing end of the core 4.

弁体13は、無負荷時にはリターンスプリング15よって常時押し上げられて、その開閉ピース14の弁座当接部がインク供出口12内縁の弁座に当接してインク供出口12を閉じ(図2参照)、リターンスプリング15の押上力に抗して芯4が押し込まれると、芯4の内端面によって開閉ピース14が押されてその弁座当接部がインク供出口12内縁の弁座から離れ、インク供出口12を開放する(図3参照)。このようにしてインク供出口12が開放されることにより、バルブユニットケース6内に貯まっていたインクが、インク供出口12を通って芯挿入筒8の縦溝10内に流入する。   The valve body 13 is always pushed up by the return spring 15 when there is no load, and the valve seat abutting portion of the opening / closing piece 14 abuts on the valve seat on the inner edge of the ink outlet 12 to close the ink outlet 12 (see FIG. 2). When the lead 4 is pushed against the push-up force of the return spring 15, the opening / closing piece 14 is pushed by the inner end surface of the lead 4, and the valve seat abutting portion is separated from the valve seat at the inner edge of the ink outlet 12. The ink outlet 12 is opened (see FIG. 3). By opening the ink outlet 12 in this way, the ink stored in the valve unit case 6 flows into the vertical groove 10 of the core insertion cylinder 8 through the ink outlet 12.

全面が開口されるバルブユニットケース6の底面は、インクタンク軸1内のインクを常時バルブユニットケース6内へ通流させるインク通流孔17を有する蓋部材16によって閉塞される(図2、3、8参照)。通例、インク通流孔17は、蓋部材16の中心部に形成される支持孔18を囲むように複数穿設される。リターンスプリング15は、その上面が弁体13の開閉ピース14の裾広がり部の裏面に当接して支持され、下面は蓋部材16に当接して支持される。また、弁体13の支持部14aの下部は、蓋部材16の中心部に形成される支持孔18内に摺動可能に挿入される。上記ストッパー14cは、芯4が押し込まれた際に、この支持孔18の上縁部に当たることにより芯4の押し込み端を規制する(図3参照)。   The bottom surface of the valve unit case 6 that is open on the entire surface is closed by a lid member 16 having an ink flow hole 17 through which the ink in the ink tank shaft 1 always flows into the valve unit case 6 (FIGS. 2 and 3). , 8). Usually, a plurality of ink flow holes 17 are formed so as to surround a support hole 18 formed at the center of the lid member 16. The upper surface of the return spring 15 is supported by being in contact with the rear surface of the flared portion of the opening / closing piece 14 of the valve body 13, and the lower surface is supported by being in contact with the lid member 16. Further, the lower portion of the support portion 14 a of the valve body 13 is slidably inserted into a support hole 18 formed in the center portion of the lid member 16. The stopper 14c regulates the pushing end of the lead 4 by hitting the upper edge of the support hole 18 when the lead 4 is pushed (see FIG. 3).

バルブユニットケース6の底面は外方に延出されてフランジ19が形成され、バルブユニットケース6は、そのフランジ19がバルブ収装筒2の下端に当接するまでバルブ収装筒2内に挿入される。その位置においてその上面がインク貯留部材5の底面に当接すると共に、そのインク供出口12が芯挿入孔8に連通状態となる(図2、3参照)。   The bottom surface of the valve unit case 6 extends outward to form a flange 19. The valve unit case 6 is inserted into the valve housing cylinder 2 until the flange 19 abuts the lower end of the valve housing cylinder 2. The At that position, the upper surface abuts against the bottom surface of the ink storage member 5, and the ink outlet 12 is in communication with the core insertion hole 8 (see FIGS. 2 and 3).

上記構成において、インクタンク軸1内のインクは、芯4を下向きにすることにより、自重で蓋部材16のインク通流孔17を自由に通り抜けてバルブユニットケース6内に流入し、そこを満たす。このバルブユニットケース6内に入り込んだインクは、芯4がバルブ収装筒2内に押し込まれてインク供出口12が開放されるまで、そこに留まる。そして、芯4がバルブ収装筒2内に押し込まれてインク供出口12が開放されると同時にインク貯留部材5内に流入し(図3)、流入したインクは、上述したように、環状板9間の狭い間隙とバルブ収装筒2の内周面との間のインク貯留空間11を充填すると共に、随時芯4に染み込んでいく。
In the above-described configuration, the ink in the ink tank shaft 1 flows through the ink flow hole 17 of the lid member 16 freely by its own weight and flows into the valve unit case 6 by filling the core 4 downward. . The ink that has entered the valve unit case 6 remains there until the core 4 is pushed into the valve housing cylinder 2 and the ink outlet 12 is opened. Then, the core 4 is pushed into the valve housing cylinder 2 and the ink outlet 12 is opened, and at the same time, the ink flows into the ink storage member 5 (FIG. 3). The ink storage space 11 between the narrow gap between 9 and the inner peripheral surface of the valve housing cylinder 2 is filled, and the core 4 is soaked as needed.

このように、本発明に係る筆記具においては、常時芯4の後半部が、インクを貯留するインク貯留空間11に囲まれた芯挿入筒8内に収まっていて、随時インクを吸収し得る状況にあるために芯4の乾きが防止される。そのため、芯の押し込みによるバルブの開放操作を頻繁に行う必要がなくなり、その操作を頻繁に行うことに起因する芯先の早期損傷が防止される。また、高速筆記しても、インクの染み込みが迅速なために、筆記文字の掠れも生じにくくなる。   Thus, in the writing instrument according to the present invention, the latter half portion of the lead 4 is always contained in the lead insertion cylinder 8 surrounded by the ink storage space 11 for storing ink, and the ink can be absorbed at any time. Therefore, the core 4 is prevented from drying. Therefore, it is not necessary to frequently perform the opening operation of the valve by pushing in the lead, and early damage to the lead due to the frequent operation is prevented. In addition, even when writing at high speed, since ink soaks quickly, writing characters are less likely to be drawn.

この発明をある程度詳細にその最も好ましい実施形態について説明してきたが、この発明の精神と範囲に反することなしに広範に異なる実施形態を構成することができることは明白である。従って、この発明は、請求の範囲において限定した以外はその特定の実施形態に制約されるものではない。   Although the invention has been described in some detail with its most preferred embodiments, it is evident that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention. Accordingly, the invention is not limited to that particular embodiment, except as limited in the claims.

1 インクタンク軸
バルブ収装筒
3 縮径部
4 芯
5 インク貯留部材
6 バルブユニットケース
7 基板
8 芯挿入筒
9 環状板
10 縦溝
11 インク貯留空間
12 インク供出口
13 弁体
14 開閉ピース
14a 支持部
14b 鍔部
14c ストッパー
15 リターンスプリング
16 蓋部材
17 インク通流孔
18 芯挿入孔
19 フランジ

DESCRIPTION OF SYMBOLS 1 Ink tank axis | shaft 2 Valve storage cylinder 3 Reduced diameter part 4 Core 5 Ink storage member 6 Valve unit case 7 Substrate 8 Core insertion cylinder 9 Annular plate 10 Vertical groove 11 Ink storage space 12 Ink outlet 13 Valve body 14 Opening / closing piece 14a Support portion 14b Hook portion 14c Stopper 15 Return spring 16 Lid member 17 Ink flow hole 18 Core insertion hole 19 Flange

Claims (5)

インクタンク軸と、前記インクタンク軸の先端開口部に嵌装されるバルブ収装筒と、前記バルブ収装筒に摺動可能に保持される芯とから成り、
前記バルブ収装筒内には、その先端側から順に、前記芯の後半部が摺動可能に挿入される芯挿入筒と前記芯挿入筒の外周面にその全長に亘って狭間隔置きに配設される環状板とから成っていて、前記芯挿入筒内に導入されたインクが前記各環状板間に流出可能に構成されるインク貯留部材と、インクの供給を制御するバルブ機構を内蔵していて、上面が前記インク貯留部材の底面に当接し、底面開口が、前記インクタンク軸内のインクを常時通流させるインク通流孔を有する蓋部材によって閉塞されるバルブユニットケースとが装填され、
前記バルブ機構は、前記芯が押し込まれることにより開いて前記インク通流孔を通して前記バルブユニットケース内に導入されているインクを前記インク貯留部材内に供出させ、前記インク貯留部材内に供出されたインクは、前記芯挿入筒から前記各環状板間に流出して前記各環状板間と前記バルブ収装筒の内周面との間のインク貯留空間を満たしてそこに貯留され、随時、後半部が前記芯挿入筒内に進入している前記芯に染み込み可能にしたことを特徴とするバルブ式筆記具。
An ink tank shaft, a valve housing cylinder fitted into a front end opening of the ink tank shaft, and a core slidably held in the valve housing cylinder,
In the valve housing cylinder, a core insertion cylinder into which the rear half of the core is slidably inserted in order from the front end side and an outer peripheral surface of the core insertion cylinder are arranged at narrow intervals over the entire length thereof. An ink storage member configured to allow ink introduced into the core insertion cylinder to flow out between the annular plates, and a valve mechanism for controlling ink supply. And a valve unit case in which the top surface is in contact with the bottom surface of the ink storage member, and the bottom surface opening is closed by a lid member having an ink flow hole for allowing the ink in the ink tank shaft to always flow. ,
The valve mechanism is opened when the core is pushed in, and the ink introduced into the valve unit case through the ink flow hole is supplied into the ink storage member, and is supplied into the ink storage member. The ink flows out from the core insertion cylinder between the annular plates, fills the ink storage space between the annular plates and the inner peripheral surface of the valve housing cylinder, and is stored there. A valve-type writing instrument characterized in that a portion can penetrate into the core entering the core insertion cylinder.
前記芯挿入筒に縦溝を形成して前記縦溝が前記各環状板間に開口するようにすることにより、前記芯挿入内に導入されたインクが前記開口から前記インク貯留空間に流出可能にした、請求項1に記載のバルブ式筆記具。 By forming a vertical groove in the core insertion cylinder so that the vertical groove opens between the annular plates, ink introduced into the core insertion cylinder can flow out from the opening into the ink storage space. The valve-type writing instrument according to claim 1. 前記インク貯留部材の環状板群を、後端に向かって縮まる緩いテーパ形状にした、請求項1又は2に記載のバルブ式筆記具。   The valve-type writing instrument according to claim 1 or 2, wherein the annular plate group of the ink storage member has a loosely tapered shape that shrinks toward the rear end. 前記バルブ収装筒の内周面を、先端に向かって縮まる緩いテーパ形状にした、請求項1又は2に記載のバルブ式筆記具。   3. The valve-type writing instrument according to claim 1, wherein an inner peripheral surface of the valve housing cylinder has a loose taper shape that shrinks toward a tip. 前記バルブユニットケース内に組み込まれる前記バルブ機構は、前記バルブユニットケース上面のインク供出口を開閉する弁体と、前記弁体を常時前記インク供出口を閉じるように付勢するリターンスプリングとから成る、請求項1乃至のいずれかに記載のバルブ式筆記具。 The valve mechanism incorporated in the valve unit case includes a valve body that opens and closes an ink supply port on the upper surface of the valve unit case, and a return spring that constantly urges the valve body to close the ink supply port. The valve-type writing instrument according to any one of claims 1 to 4 .
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